#' Metadata of the simulated microbiome samples
#'
#'This data set includes 100 simulated samples from 50 subjects, with two samples from each subject. 
#'The metadata contain subject IDs and data from four variables, two (X.between and Y.between) varying between subjects 
#'and two (X.within and Y.within) varying within subjects.
#'
#' @docType data
#'
#' @usage data("sim.meta")
#'
#' @format A data frame with 100 observations on 5 variables.
#'
#' @keywords datasets
#'
#' @examples
#' data(sim.meta)
"sim.meta"